CN115622190A - Mobile energy storage power supply equipment, controller and control method of internal power converter of mobile energy storage power supply equipment - Google Patents
Mobile energy storage power supply equipment, controller and control method of internal power converter of mobile energy storage power supply equipment Download PDFInfo
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- CN115622190A CN115622190A CN202211360039.5A CN202211360039A CN115622190A CN 115622190 A CN115622190 A CN 115622190A CN 202211360039 A CN202211360039 A CN 202211360039A CN 115622190 A CN115622190 A CN 115622190A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention provides a mobile energy storage power supply device, a controller and a control method of an internal power converter thereof, which relate to the field of power supplies.
Description
Technical Field
The invention relates to the field of power supplies, in particular to a mobile energy storage power supply device, a controller and a control method of an internal power converter of the mobile energy storage power supply device.
Background
The mobile energy storage power supply is a small energy storage device which replaces a traditional small fuel oil generator and is internally provided with a lithium ion battery, has the characteristics of high capacity, high power, safety and portability, can provide a power supply system for outputting stable alternating current/direct current voltage, has the battery capacity of between 100Wh and 3000Wh, is provided with various output interfaces such as AC, DC, type-C, USB, PD and the like, can be matched with mainstream electronic equipment in the market, and is suitable for a plurality of scenes such as outdoor outing, emergency relief, medical emergency, outdoor operation and the like.
The mobile energy storage power supply mainly uses the terminal customer as the main object, and supplies power to the electric equipment when the user scene is family outdoor travel or supplies power to the electric tool when the user scene is outdoor operation. At present, mobile energy storage power sources exhibit explosive growth.
The mobile energy storage power supply is internally provided with a power converter which is used for converting alternating current or direct current into electric energy suitable for charging the built-in battery. Therefore, the mobile energy storage power supply also comprises a direct current input interface used for being connected with a direct current power supply and an alternating current input interface used for being connected with an alternating current source.
The current common direct current power supply comprises a photovoltaic source provided by a solar panel and a constant direct current source. Different direct current power supplies have different characteristics, and different control modes are required for different direct current power supplies.
In addition, in order to reduce the size and cost of the built-in power converter and improve the efficiency of the built-in power converter, a plurality of power converters are usually built in, and each power converter is connected with a direct current power supply to supply power to the power converter.
In order to improve the good experience of users, miniaturization, low cost, high efficiency and high reliability are important development trends of the mobile energy storage power supply.
Disclosure of Invention
The application provides a control method for a power converter in a mobile energy storage power supply, which comprises the following steps: s11: sampling an input voltage of a power converter; s12: judging whether the input voltage of the power converter is in a working range, if so, entering a step S13, otherwise, continuing to perform the step S11; s13: controlling the input current of the power converter to increase from 0A, sampling and recording the current input voltage of the power converter as an initial input voltage U0; s14: when the input current of the power converter is increased to be larger than a threshold value, sampling and recording the input voltage of the power converter at present as a first input voltage U1; s15: judging whether the absolute value of the difference value between the first input voltage U1 and the initial input voltage U0 is greater than a set threshold value, if so, entering a step S16, and if not, entering a step S17; s16: judging that the direct current source is a photovoltaic source, and controlling a power converter by adopting an MPPT algorithm; s17: and judging that the direct current source is a constant direct current source, and controlling the power converter by adopting a constant voltage algorithm.
Furthermore, the mobile energy storage power supply includes a plurality of power converters, each power converter is configured to receive a dc power from a dc power supply and convert the dc power provided by the dc power supply into an electric energy suitable for charging the internal battery, and the mobile energy storage power supply further includes: in the process of increasing the input current of the first path of power converter in the plurality of power converters, the change of the input voltage of the second path of power converter in the plurality of power converters is monitored to judge whether the direct current power supply is homologous.
Still further, still include: s31: controlling the input current of a first path of power converter in the multi-path power converter to increase from 0A, sampling and recording the input voltage of a second path of power converter in the current multi-path power converter as a second path of initial input voltage Un0; s32: when the input current of the first path of power converter is increased to be larger than a threshold value, sampling and recording the current input voltage of the second path of power converter as a second path of first input voltage Un1; s33: judging whether the absolute value of the difference value between the second path of first input voltage Un1 and the second path of initial input voltage Un0 is greater than a set threshold value, if so, entering a step S34, and if not, entering a step S35; s34: if the multi-path power converter is judged to be homologous, the second path power converter is not enabled; s35: determining that the multiple power converters are not the same source enables the second power converter.
Further, the method also comprises the following steps: s41: controlling the input current of a first power converter in the multi-path power converters to increase from 0A; s42: when the input current of the first path of power converter is increased to be larger than a threshold value, sampling and recording the current input voltage of the first path of power converter as a first path of input voltage Un11, and the input voltage of a second path of power converter in the multi-path power converter as a second path of input voltage Un22; s43: judging whether the second path of input voltage Un22 is equal to the first path of input voltage Un11, if so, entering a step S44, and if not, entering a step S45; s44: if the multi-path power converter is judged to be homologous, the second path power converter is not enabled; s45: determining that the multiple power converters are different sources enables the second power converter.
The application also provides a controller, which comprises a sampling unit, a judging unit and a control unit, wherein the sampling unit is used for sampling the input voltage of the power converter in the mobile energy storage power supply, and the judging unit is used for receiving the input voltage of the power converter output by the sampling unit and outputting a command signal according to the input voltage of the power converter; the control unit receives the instruction signal and outputs a control signal for controlling the power converter according to the instruction signal, wherein the controller executes the following steps: s21: the sampling unit samples the input voltage of the power converter; s22: the judging unit judges whether the input voltage of the power converter is in a working range or not, outputs a first command signal, if so, enters a step S23, otherwise, continues to the step S21; s23: the control unit receives a first instruction signal, controls the input current of the power converter to increase from 0A according to the first instruction signal, and the sampling unit samples and records the current input voltage of the power converter as an initial input voltage U0; s24: when the input current of the power converter is increased to be larger than a threshold value, the sampling unit samples and records the input voltage of the power converter at present as a first input voltage U1; s25: the judging unit receives the first input voltage U1 and the initial input voltage U0, judges whether the absolute value of the difference value of the first input voltage U1 and the initial input voltage U0 is larger than a set threshold value or not, outputs a second instruction signal, if yes, the step S26 is carried out, and if not, the step S27 is carried out; s26: the control unit receives the second instruction signal, judges that the direct current source is a photovoltaic source according to the second instruction signal, and controls the power converter by adopting an MPPT algorithm; s27: the control unit receives the second instruction signal, judges the direct current source to be a constant direct current source according to the second instruction signal, and controls the power converter by adopting a constant voltage algorithm.
Further, the controller further performs: in the process that the control unit controls and increases the input current of the first power converter in the plurality of power converters, the sampling unit monitors the change of the input voltage of the second power converter in the plurality of power converters, so that the control unit judges whether the direct-current power supply is homologous or not.
Further, the controller performs the steps of: s51: the control unit controls the input current of a first path of power converter in the multi-path power converter to increase from 0A, and the sampling unit samples and records the input voltage of a second path of power converter in the current multi-path power converter as a second path of initial input voltage Un0; s52: when the input current of the first path of power converter is increased to be larger than a threshold value, the sampling unit samples and records the input voltage of a second path of power converter in the current multi-path power converter as a second path of first input voltage Un1; s53: the judging unit receives the second path of first input voltage Un1 and the second path of initial input voltage Un0, judges whether the absolute value of the difference value between the second path of first input voltage Un1 and the second path of initial input voltage Un0 is greater than a set threshold value, outputs a third instruction signal, if so, enters step S34, and if not, enters step S35; s54: the control unit receives a third instruction signal, judges the multiple paths of power converters to be homologous according to the third instruction signal, and does not enable the second path of power converter; s55: and the control unit receives the third instruction signal, judges different sources of the multi-path power converters according to the third instruction signal, and enables the second path of power converter.
Further, the controller performs the steps of: s61: the control unit controls the input current of a first path of power converter in the multi-path power converters to increase from 0A; s62: when the input current of the first path of power converter is increased to be larger than a threshold value, the sampling unit samples and records the current input voltage of the first path of power converter as a first path of first input voltage, and the input voltage of a second path of power converter in the multi-path power converter is a second path of first input voltage; s63: the judging unit receives the first path of first input voltage and the second path of first input voltage, judges whether the second path of first input voltage is equal to the first path of first input voltage or not, outputs a third instruction signal, and if yes, enters step S64, and if not, enters step S65; s64: the control unit receives a third instruction signal, judges the multiple power converters to be homologous according to the third instruction signal, and does not enable the second power converter; s65: and the control unit receives the third command signal, judges that the multipath power converters are different in source according to the third command signal and enables the second path of power converter.
The application also provides a portable energy storage power supply equipment, includes: the power converters are used for receiving voltage output by the direct current power supply and converting direct current provided by the direct current power supply into electric energy suitable for charging a built-in battery of the mobile energy storage power supply equipment; and the controller is connected with the input ends of the plurality of power converters and used for receiving the input voltages of the plurality of power converters and outputting control signals for controlling the plurality of power converters to work according to the input voltages, wherein the controller executes the control method.
Further, the power converter is a boost converter or a buck converter.
Further, the power converter is an isolated converter or a non-isolated converter.
Further, the controller is a digital controller or an analog controller.
Drawings
Fig. 1 illustrates a first exemplary mobile energy storage power system.
Fig. 2 is a flowchart of a method for controlling a power converter in a mobile energy storage power supply.
Fig. 3 is a schematic diagram of a second exemplary mobile energy storage power system.
Fig. 4 is a flowchart of a method for controlling a power converter in a mobile energy storage power supply.
Fig. 5 is a flowchart of a method for controlling a power converter in a mobile energy storage power supply.
Fig. 6 is a schematic diagram of the controller.
Fig. 7 is a schematic diagram of a mobile energy storage power supply apparatus.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art based on the embodiments of the present invention without any creative effort, fall within the protection scope of the present invention.
Referring to the schematic diagram of a first exemplary mobile energy storage power system shown in fig. 1, a power converter, such as the first power converter 110 in fig. 1, is disposed in the mobile energy storage power source 10 and is configured to receive a voltage output by a dc power supply and convert a dc power provided by the dc power supply into an electric energy suitable for charging a built-in battery. As shown in fig. 1, the dc power supply is a first dc source 21. Fig. 1 shows only a part of the structure of the mobile energy storage power supply 10, but it may be configured with other structures.
The current common direct current power supply comprises a photovoltaic source provided by a solar panel and a constant direct current source. Different direct current power supplies have different characteristics, the types of the direct current power supplies need to be identified, and different control modes are adopted for different direct current power supplies.
Based on the first exemplary mobile energy storage power system shown in fig. 1, an embodiment of the present invention provides a method for controlling a power converter in a mobile energy storage power source 10. The control method provided by the application adopts different corresponding control strategies based on the difference of the photovoltaic source and the constant direct current source provided by the solar cell panel. Specifically, please refer to the flowchart of the method for controlling the power converter in the mobile energy storage power supply shown in fig. 2, which includes:
s11: sampling an input voltage of a power converter;
s12: judging whether the input voltage of the power converter is in a working range, if so, entering a step S13, otherwise, continuing to perform the step S11;
s13: controlling the input current of the power converter to increase from 0A, sampling and recording the current input voltage of the power converter as an initial input voltage U0;
s14: when the input current of the power converter is increased to be larger than a threshold value, sampling and recording the input voltage of the power converter at present as a first input voltage U1;
s15: judging whether the absolute value of the difference value between the first input voltage U1 and the initial input voltage U0 is greater than a set threshold value, if so, entering a step S16, and if not, entering a step S17;
s16: judging that the direct current source is a photovoltaic source, and controlling a Power converter by adopting an MPPT (Maximum Power Point Tracking) algorithm;
s17: and judging that the direct current source is a constant direct current source, and controlling the power converter by adopting a constant voltage algorithm.
For a photovoltaic source, its output voltage decreases as its output current increases. For a constant dc source, its output voltage does not change as its output current changes, i.e. its output voltage is constant. Of course, there may be some deviation from the constancy here. Therefore, the output voltage of different direct current power supplies has different characteristics along with the conversion of the output current.
By monitoring the change of the input voltage of the power converter (namely the output voltage of the direct current power supply) in the process of increasing the input current of the power converter (namely the output current of the direct current power supply). When the output current of the direct current power supply is increased from 0A to be larger than a threshold value, if the output voltage of the direct current power supply is reduced by an amount larger than a certain value relative to the output voltage of the direct current power supply when the output current of the direct current power supply is 0A, the direct current power supply conforms to the characteristic of a photovoltaic source, and the direct current power supply is judged to be the photovoltaic source; if the output voltage of the direct current power supply is basically unchanged relative to the output voltage of the corresponding direct current power supply when the output current of the direct current power supply is 0A, namely the output voltage is not reduced, the direct current power supply accords with the characteristic of a constant direct current source, and the direct current power supply is judged to be the constant direct current source. Therefore, the type of the direct current power supply can be accurately judged, the judging method is simple, additional devices are not required to be added, and the cost is low.
In order to increase the charging speed of the battery built in the mobile energy storage power supply, it is desirable that the mobile energy storage power supply system output at the maximum power, that is, the power converter in the mobile energy storage power supply 10 operates in the maximum output power mode.
And when the direct current power supply is judged to be a constant direct current source, a constant voltage algorithm is adopted to control the power converter in the movable energy storage power supply, so that the power converter operates in a maximum output power mode. The constant voltage algorithm is that the duty ratio of a corresponding switch tube in the power converter when the power converter operates in the maximum output power mode is calculated according to the input voltage of the power converter, and the switch tube in the power converter is controlled to be switched on/off by the duty ratio, so that the power converter rapidly operates in the maximum output power mode, the response speed of the power converter can be increased, and the charging efficiency of a battery built in the mobile energy storage power supply is increased.
And when the direct current power supply is judged to be a photovoltaic source, the MPPT algorithm is adopted to control a power converter in the mobile energy storage power supply, so that the power converter operates in a maximum output power mode. The output power of the photovoltaic power supply is related to the working voltage of the power converter, and only when the power converter works at the most appropriate voltage, the output power of the photovoltaic power supply has a unique maximum value. The MPPT algorithm tracks the maximum output power of the power converter by changing the duty ratio of a switching tube in the power converter, if the duty ratio of the switching tube is increased, if the output power of the power converter is increased, the duty ratio of the switching tube is continuously increased, and if the output power is reduced, the duty ratio of the switching tube is reduced, so that the power converter works in a maximum output power mode by continuous optimization. And the maximum output power of the photovoltaic power supply is not fixed, so that duty ratio disturbance needs to be added intermittently to find a true maximum power point.
The constant voltage algorithm and the MPPT algorithm are common knowledge in the art and will not be described herein.
Therefore, the type of the direct-current power supply is firstly determined by the method provided by the application, and then different control modes are adopted according to the type of the direct-current power supply, so that the direct-current power supply outputs the maximum power, namely, the built-in power converter of the mobile energy storage power supply operates in the maximum output power mode, the response speed of the built-in power converter of the mobile energy storage power supply is increased, and the charging efficiency of the built-in battery of the mobile energy storage power supply is increased.
In order to reduce the size and cost of the power converter built in the mobile energy storage power supply and improve the efficiency of the power converter, a plurality of power converters are usually built in the mobile energy storage power supply. Referring to the schematic diagram of a second exemplary mobile energy storage power supply system shown in fig. 3, a plurality of power converters, such as the first power converter 110 to the nth power converter 1n0 in fig. 3, are disposed in the mobile energy storage power supply 10, each of which is configured to receive a dc power output by a dc power supply and convert the dc power provided by the dc power supply into an electric energy suitable for charging a built-in battery, such as the first dc power source 21 to the nth dc power source 2n in fig. 3.
When the first direct current source 21 to the nth direct current source 2n are all photovoltaic sources, the usage scenario is also a conventional scenario for outdoor use of the mobile energy storage power source. The method aims to avoid the situation that the power converters cannot work normally when a user uses a group of photovoltaic sources to simultaneously provide input sources for a plurality of power converters. When the direct current source is judged to be the photovoltaic source by adopting the mode, whether the multi-path power converter adopts the same group of photovoltaic sources for power supply or not, namely whether the multi-path power converter is homologous or not is judged.
Specifically, as shown in fig. 3, the output ends of the multiple power converters share the BAT-battery ground, the current of one power converter also passes through the sampling resistors of the other power converters, and the current sampling value of the power converter is necessarily small due to current shunting, and when the current sampling signal is small, the target current of the controller remains unchanged, which inevitably causes the current actually flowing through the switching tube in the power converter to be larger than the target current, and causes the heating value of the switching tube in the power converter to be large, so that the switching tube in the power converter will be burned out due to overheating after operating for a period of time. It is therefore desirable to avoid using a set of photovoltaic sources to power multiple power converters simultaneously.
Further, referring to the flowchart of the method for controlling the internal power converter of the mobile energy storage power supply shown in fig. 4, when the plurality of dc sources are photovoltaic sources, the method for controlling the internal power converter of the mobile energy storage power supply further includes:
s31: controlling the input current of a first path of power converter in the multi-path power converter to increase from 0A, sampling and recording the input voltage of a second path of power converter in the current multi-path power converter as a second path of initial input voltage Un0;
s32: when the input current of the first path of power converter is increased to be larger than a threshold value, sampling and recording the current input voltage of the second path of power converter as a second path of first input voltage Un1;
s33: judging whether the absolute value of the difference value between the second path of first input voltage Un1 and the second path of initial input voltage Un0 is greater than a set threshold value, if so, entering a step S34, and if not, entering a step S35;
s34: if the multi-path power converter is judged to be homologous, the second path power converter is not enabled;
s35: determining that the multiple power converters are not the same source enables the second power converter.
Therefore, in the process of increasing the input current of the first path of power converter, the change of the input voltage of the second path of power converter is monitored, and when the input voltage of the second path of power converter is reduced, the direct-current power supply is homologous, so that homologous faults are avoided, the efficiency of a mobile energy storage power supply system is improved, and the second path of power converter is not enabled; when the input voltage of the second power converter is not reduced, the direct current power supply source is not at the same source, and the second power converter and the multi-channel converter can work at the same time. Therefore, the faults caused by homology can be avoided, the judgment method is simple, additional devices are not required to be added, and the cost is low.
Referring to the flowchart of the method for controlling the internal power converter of the mobile energy storage power supply shown in fig. 5, when the plurality of dc sources are photovoltaic sources, the method for controlling the internal power converter of the mobile energy storage power supply may further include:
s41: controlling the input current of a first path of power converter in the multi-path power converter to increase from 0A;
s42: when the input current of the first path of power converter is increased to be larger than a threshold value, sampling and recording the current input voltage of the first path of power converter as a first path of input voltage Un11, and the input voltage of a second path of power converter in the multi-path power converter as a second path of input voltage Un22;
s43: judging whether the second path of input voltage Un22 is equal to the first path of input voltage Un11, if so, entering a step S44, and if not, entering a step S45;
s44: if the multi-path power converter is judged to be homologous, the second path power converter is not enabled;
s45: determining that the multiple power converters are different sources enables the second power converter.
Therefore, in the process of increasing the input current of the first path of power converter, the change of the input voltage of the first path of power converter and the change of the input voltage of the second path of power converter are monitored, and when the input voltage of the second path of power converter is reduced along with the first path of power converter, the direct-current power supply is homologous, so that the homologous faults are avoided, the efficiency of the mobile energy storage power supply system is improved, and the second path of power converter is not enabled; when the input voltage of the second power converter is not reduced along with the first power converter, the direct current power supply source is not the same source, and the second power converter and the multi-channel converter can work simultaneously. Therefore, the faults caused by homology can be avoided, the judgment method is simple, additional devices are not required to be added, and the cost is low.
Therefore, in the two methods, in the process of increasing the input current of the first path of power converter, the change of the input voltage of the second path of power converter is monitored so as to judge whether the direct-current power supply is homologous.
Therefore, the type of the direct current source can be judged firstly, the power converter works in a maximum output power mode by adopting a corresponding control mode, when the mobile energy storage power supply is internally provided with the multiple paths of power converters, and the direct current sources of the multiple paths of power converters are all photovoltaic sources, whether the multiple direct current sources are homologous or not is judged, if so, only one path of direct current sources works, and if not, the multiple paths of direct current sources work together. Therefore, the power converter can work in the maximum output power mode rapidly, the charging efficiency is improved, and the mobile energy storage power supply is high in reliability.
In an embodiment of the present application, referring to the schematic diagram of the controller shown in fig. 6, the controller 300 includes a sampling unit 310, a determining unit 320 and a control unit 330, where the sampling unit 310 is configured to sample an input voltage of a power converter in the mobile energy storage power supply, and the determining unit 320 is configured to receive the input voltage of the power converter output by the sampling unit 310 and output a command signal according to the input voltage of the power converter; the control unit 330 receives the command signal and outputs a control signal for controlling the power converter according to the command signal, wherein the controller 300 performs the following steps:
s21: the sampling unit 310 samples an input voltage of the power converter;
s22: the determining unit 320 determines whether the input voltage of the power converter is within the working range, and outputs a first command signal, if so, the process proceeds to step S23, otherwise, the process proceeds to step S21;
s23: the control unit 330 receives the first instruction signal, controls the input current of the power converter to increase from 0A according to the first instruction signal, and the sampling unit 310 samples and records the current input voltage of the power converter as an initial input voltage U0;
s24: when the input current of the power converter increases to be larger than a threshold value, the sampling unit 310 samples and records the input voltage of the power converter at present as a first input voltage U1;
s25: the determining unit 320 receives the first input voltage U1 and the initial input voltage U0, determines whether an absolute value of a difference between the first input voltage U1 and the initial input voltage U0 is greater than a set threshold, outputs a second instruction signal, if yes, proceeds to step S26, and if no, proceeds to step S27;
s26: the control unit 330 receives the second instruction signal, determines that the dc source is a photovoltaic source according to the second instruction signal, and controls the Power converter by using an MPPT (Maximum Power Point Tracking) algorithm;
s27: the control unit 330 receives the second command signal, determines the dc source as a constant dc source according to the second command signal, and controls the power converter using a constant voltage algorithm.
Further, the controller 300 performs the following steps:
s51: the control unit 330 controls the input current of the first power converter in the multi-path power converter to increase from 0A, and the sampling unit 310 samples and records the input voltage of the second power converter in the current multi-path power converter as a second initial input voltage Un0;
s52: when the input current of the first power converter is increased to be greater than a threshold value, the sampling unit 310 samples and records the input voltage of a second power converter in the current multi-path power converter as a second first input voltage Un1;
s53: the determining unit 320 receives the second path of first input voltage Un1 and the second path of initial input voltage Un0, determines whether an absolute value of a difference between the second path of first input voltage Un1 and the second path of initial input voltage Un0 is greater than a set threshold, outputs a third instruction signal, if yes, enters step S34, and if no, enters step S35;
s54: the control unit 330 receives the third instruction signal, and determines that the multi-channel power converters are homologous according to the third instruction signal, and the control unit 330 does not enable the second channel power converter;
s55: the control unit 330 receives the third command signal, determines that the multiple power converters are different sources according to the third command signal, and the control unit 330 enables the second power converter.
Further, the controller 300 performs the following steps:
s61: the control unit 330 controls the input current of the first power converter in the multi-path power converters to increase from 0A;
s62: when the input current of the first path of power converter is increased to be greater than a threshold value, the sampling unit 310 samples and records that the current input voltage of the first path of power converter is a first path of first input voltage Un11, and the input voltage of a second path of power converter in the multi-path power converter is a second path of first input voltage Un1;
s63: the determining unit 320 receives the first path of first input voltage Un11 and the second path of first input voltage Un1, determines whether the second path of first input voltage Un1 is equal to the first path of first input voltage Un11, outputs a third instruction signal, if yes, enters step S64, and if no, enters step S65;
s64: the control unit 330 receives the third instruction signal, and determines that the multi-channel power converter is homologous according to the third instruction signal, and the control unit 330 does not enable the second channel power converter;
s65: the control unit 330 receives the third command signal and determines that the multiple power converters are different sources according to the third command signal, and the control unit 330 enables the second power converter.
The second power converter may only include one power converter, for example, the first power converter 110 in fig. 3 is a first power converter, and the second power converter 120 is a second power converter.
The second power converter may only include a plurality of power converters, for example, the first power converter 110 in fig. 3 is a first power converter, and the second power converter 120 forms a second power converter for the nth power converter 1n 0.
In an embodiment of the present application, a mobile energy storage power supply device is further provided, please refer to fig. 7, in which the mobile energy storage power supply device 10 includes:
a plurality of power converters, each power converter being configured to receive a voltage output by a dc power supply and convert dc power provided by the dc power supply into electric energy suitable for charging the battery 400 built in the mobile energy storage power supply device;
and a controller 300, connected to the input terminals of the plurality of power converters, for receiving the input voltages of the plurality of power converters and outputting control signals for controlling the plurality of power converters to operate according to the input voltages, wherein the controller 300 implements the above-mentioned method for controlling the power converters in the mobile energy storage power source.
The principle and advantages are the same as those of the above-mentioned control method for the power converter in the mobile energy storage power supply, and are not described herein again.
As shown in fig. 3, the plurality of power converters include a first power converter 110 to an nth power converter 1n0, and further include a plurality of dc power supplies respectively corresponding to the first dc source 21 to the nth dc source 2n, and the first power converter 110 to the nth power converter 1n0 respectively receive the dc power supplied by the first dc source 21 to the nth dc source 2n one by one.
In an embodiment, the power converter is a boost converter or a buck converter. Further, the power converter is an isolated converter or a non-isolated converter.
In one embodiment, the controller is a digital controller, such as a DSP. Of course the controller described above may also be implemented by analog circuitry.
The threshold value can be set according to actual design requirements.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (12)
1. A method for controlling a power converter in a mobile energy storage power supply is characterized by comprising the following steps:
s11: sampling an input voltage of a power converter;
s12: judging whether the input voltage of the power converter is in a working range, if so, entering a step S13, otherwise, continuing to perform the step S11;
s13: controlling the input current of the power converter to increase from 0A, sampling and recording the current input voltage of the power converter as an initial input voltage U0;
s14: when the input current of the power converter is increased to be larger than a threshold value, sampling and recording the input voltage of the power converter at present as a first input voltage U1;
s15: judging whether the absolute value of the difference value between the first input voltage U1 and the initial input voltage U0 is greater than a set threshold value, if so, entering a step S16, and if not, entering a step S17;
s16: judging that the direct current source is a photovoltaic source, and controlling a power converter by adopting an MPPT algorithm;
s17: and judging that the direct current source is a constant direct current source, and controlling the power converter by adopting a constant voltage algorithm.
2. The method for controlling a power converter in a mobile energy storage power supply according to claim 1, wherein the mobile energy storage power supply comprises a plurality of power converters, each power converter is configured to receive a dc power from a dc power supply and convert the dc power from the dc power supply into an electric energy suitable for charging an internal battery, and the method further comprises:
in the process of increasing the input current of the first path of power converter in the plurality of power converters, the change of the input voltage of the second path of power converter in the plurality of power converters is monitored to judge whether the direct current power supply is homologous.
3. The method of controlling a power converter in a mobile energy storage power source of claim 2, further comprising:
s31: controlling the input current of a first path of power converter in the multi-path power converter to increase from 0A, sampling and recording the input voltage of a second path of power converter in the current multi-path power converter as a second path of initial input voltage Un0;
s32: when the input current of the first path of power converter is increased to be larger than a threshold value, sampling and recording the current input voltage of the second path of power converter as a second path of first input voltage Un1;
s33: judging whether the absolute value of the difference value between the second path of first input voltage Un1 and the second path of initial input voltage Un0 is greater than a set threshold value, if so, entering a step S34, and if not, entering a step S35;
s34: if the multi-path power converter is judged to be homologous, the second path power converter is not enabled;
s35: determining that the multiple power converters are different sources enables the second power converter.
4. The method of claim 2, further comprising:
s41: controlling the input current of a first path of power converter in the multi-path power converter to increase from 0A;
s42: when the input current of the first path of power converter is increased to be larger than a threshold value, sampling and recording the current input voltage of the first path of power converter as a first path of input voltage Un11, and the input voltage of a second path of power converter in the multi-path power converter as a second path of input voltage Un22;
s43: judging whether the second path of input voltage Un22 is equal to the first path of input voltage Un11, if so, entering a step S44, and if not, entering a step S45;
s44: if the multi-path power converter is judged to be homologous, the second path power converter is not enabled;
s45: determining that the multiple power converters are different sources enables the second power converter.
5. A controller is characterized by comprising a sampling unit, a judging unit and a control unit, wherein the sampling unit is used for sampling the input voltage of a power converter in a mobile energy storage power supply, and the judging unit is used for receiving the input voltage of the power converter output by the sampling unit and outputting a command signal according to the input voltage of the power converter; the control unit receives the instruction signal and outputs a control signal for controlling the power converter according to the instruction signal, wherein the controller executes the following steps:
s21: the sampling unit samples the input voltage of the power converter;
s22: the judging unit judges whether the input voltage of the power converter is in a working range or not, outputs a first command signal, if so, enters a step S23, otherwise, continues to the step S21;
s23: the control unit receives a first instruction signal, controls the input current of the power converter to increase from 0A according to the first instruction signal, and the sampling unit samples and records the current input voltage of the power converter as an initial input voltage U0;
s24: when the input current of the power converter is increased to be larger than a threshold value, the sampling unit samples and records the input voltage of the power converter at present as a first input voltage U1;
s25: the judging unit receives the first input voltage U1 and the initial input voltage U0, judges whether the absolute value of the difference value of the first input voltage U1 and the initial input voltage U0 is larger than a set threshold value or not, outputs a second instruction signal, if yes, the step S26 is carried out, and if not, the step S27 is carried out;
s26: the control unit receives the second instruction signal, judges that the direct current source is a photovoltaic source according to the second instruction signal, and controls the power converter by adopting an MPPT algorithm;
s27: the control unit receives the second instruction signal, judges the direct current source to be a constant direct current source according to the second instruction signal, and controls the power converter by adopting a constant voltage algorithm.
6. The controller according to claim 5, wherein the controller further performs:
in the process that the control unit controls and increases the input current of the first power converter in the plurality of power converters, the sampling unit monitors the change of the input voltage of the second power converter in the plurality of power converters, so that the control unit judges whether the direct-current power supply is homologous or not.
7. The controller of claim 6, wherein the controller performs the steps of:
s51: the control unit controls the input current of a first power converter in the multi-path power converters to increase from 0A, and the sampling unit samples and records the input voltage of a second power converter in the current multi-path power converters as a second initial input voltage Un0;
s52: when the input current of the first power converter is increased to be larger than a threshold value, the sampling unit samples and records the input voltage of a second power converter in the current multi-path power converter as a second first input voltage Un1;
s53: the judging unit receives the second path of first input voltage Un1 and the second path of initial input voltage Un0, judges whether the absolute value of the difference value between the second path of first input voltage Un1 and the second path of initial input voltage Un0 is greater than a set threshold value or not, outputs a third command signal, if yes, the step S34 is executed, and if not, the step S35 is executed;
s54: the control unit receives a third instruction signal, judges the multiple paths of power converters to be homologous according to the third instruction signal, and does not enable the second path of power converter;
s55: and the control unit receives the third instruction signal, judges different sources of the multi-path power converters according to the third instruction signal, and enables the second path of power converter.
8. The controller of claim 6, wherein the controller performs the steps of:
s61: the control unit controls the input current of a first power converter in the multi-path power converters to increase from 0A;
s62: when the input current of the first path of power converter is increased to be larger than a threshold value, the sampling unit samples and records the current input voltage of the first path of power converter as a first path of first input voltage, and the input voltage of a second path of power converter in the multi-path power converter is a second path of first input voltage;
s63: the judging unit receives the first path of first input voltage and the second path of first input voltage, judges whether the second path of first input voltage is equal to the first path of first input voltage or not, outputs a third instruction signal, and if yes, enters step S64, and if not, enters step S65;
s64: the control unit receives a third instruction signal, judges the multiple power converters to be homologous according to the third instruction signal, and does not enable the second power converter;
s65: the control unit receives the third instruction signal, judges different sources of the multi-path power converter according to the third instruction signal, and enables the second path power converter.
9. A mobile energy storage power supply apparatus, comprising:
the power converters are used for receiving voltage output by the direct current power supply and converting direct current provided by the direct current power supply into electric energy suitable for charging a built-in battery of the mobile energy storage power supply equipment;
a controller connected to the input terminals of the plurality of power converters, for receiving the input voltages of the plurality of power converters and outputting control signals for controlling the operation of the plurality of power converters according to the input voltages, wherein the controller performs the control method of any one of claims 1 to 4.
10. The mobile energy storage power supply apparatus of claim 9, wherein the power converter is a boost converter or a buck converter.
11. The mobile energy storage power supply apparatus of claim 10, wherein the power converter isolates the converter or is a non-isolated converter.
12. The mobile energy storage power supply apparatus of claim 9, wherein the controller is a digital controller or an analog controller.
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